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VLBI Astrometry of AGB Variables with VERA --- A Semiregular Variable S Crateris ---
Hirota, Tomoya; Kurayama, Tomoharu; Honma, Mareki +40 more
We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA) telescopes, we measured the absolute proper motion of a water maser spot associated with S Crt, referred to the quasar J1147-0724 located at an angular …
Suzaku Detection of an Intense X-Ray Flare from an A-Type Star, HD161084
Sugawara, Yasuharu; Maeda, Yoshitomo; Tsujimoto, Masahiro +4 more
We report on a serendipitous detection of an intense X-ray flare from the Tycho reference source on HD161084 during a Suzaku observation of the galactic center region for ∼20ks. The X-ray Imaging Spectrometer recorded a flare from this A1-type dwarf or subgiant star with a flux of ∼1.4 × 10-12 erg s-1 cm-2 (0.5--10…
VERA Observations of SiO Masers in the Symbiotic Star R Aquarii
Hirota, Tomoya; Kurayama, Tomoharu; Honma, Mareki +28 more
We present phase-referenced maps of the SiO maser transitions v = 1 J = 1--0 and v = 2 J = 1--0 from the symbiotic stellar system R Aquarii, which hosts an evolved AGB star plus a hot companion. Observations were performed at two epochs: 2004.98 and 2005.98. Accurate absolute coordinates and proper motions of the emission centroid were obtained; t…